CVE-2011-2500: The host_reliable_addrinfo function in support/export/hostname.c in nfs-utils before 1.2.4 does not properly u

Q: How do I fix CVE-2011-2500?

nfs-utils: upgrade to newer than 1.2.3. Exact commands for each OS are on this page.

Q: Is CVE-2011-2500 being exploited?

CVE-2011-2500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-2500 affect?

CVE-2011-2500 affects nfs-utils. Severity is high (CVSS 7.5). The host_reliable_addrinfo function in support/export/hostname.c in nfs-utils before 1.2.4 does not properly use DNS to verify access to NFS exports, which allows remote attackers to mount filesystems by establishing crafted DNS A and PTR r

Q: How urgent is CVE-2011-2500?

Priority 53/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2011-2500 is a high-severity flaw (CVSS 7.5) affecting nfs-utils. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The host_reliable_addrinfo function in support/export/hostname.c in nfs-utils before 1.2.4 does not properly use DNS to verify access to NFS exports, which allows remote attackers to mount filesystems by establishing crafted DNS A and PTR records.

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-264
Published	2014-02-15
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: linux-nfs

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2014-02-15 14:57 UTCPublished CVE record published
2026-06-16 23:31 UTCUpdated Record last modified

linux-nfs nfs-utils UPGRADE

Affected: <= 1.2.3 · 1.2.0 · 1.2.1 · 1.2.2

Fixed in: newer than 1.2.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy nfs-utils || rpm -q nfs-utils || nfs-utils --version

2. UPGRADE to newer than 1.2.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nfs-utils

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nfs-utils

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-2500?

nfs-utils: upgrade to newer than 1.2.3. Exact commands for each OS are on this page.

Is CVE-2011-2500 being exploited?

CVE-2011-2500 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-2500 affect?

CVE-2011-2500 affects nfs-utils. Severity is high (CVSS 7.5). The host_reliable_addrinfo function in support/export/hostname.c in nfs-utils before 1.2.4 does not properly use DNS to verify access to NFS exports, which allows remote attackers to mount filesystems by establishing crafted DNS A and PTR r

How urgent is CVE-2011-2500?

Priority 53/100. High severity; On your watchlist

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References

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